Abstract
Some plant NLR immune receptors are encoded in head-to-head “sensor-executor” pairs that function together. Alleles of the NLR pair CHS3/CSA1 form three clades. The clade 1 sensor CHS3 contains an integrated domain (ID) with homology to regulatory domains, which is lacking in clades 2 and 3. In this study, we defined two cell-death regulatory modes for CHS3/CSA1 pairs. One is mediated by ID domain on clade 1 CHS3, and the other relies on CHS3/CSA1 pairs from all clades detecting perturbation of an associated pattern-recognition receptor (PRR) co-receptor. Our data support the hypothesis that an ancestral Arabidopsis CHS3/CSA1 pair gained a second recognition specificity and regulatory mechanism through ID acquisition while retaining its original specificity as a “guard” against PRR co-receptor perturbation. This likely comes with a cost, since both ID and non-ID alleles of the pair persist in diverse Arabidopsis populations through balancing selection.
Original language | English |
---|---|
Pages (from-to) | 1701-1716.e5 |
Journal | Cell Host and Microbe |
Volume | 30 |
Issue number | 12 |
Early online date | 17 Oct 2022 |
DOIs | |
Publication status | Published - 14 Dec 2022 |
Keywords
- BAK1
- CHS3
- co-evolution
- CSA1
- guard hypothesis
- paired NLR
- plant immune system
- specialization
ASJC Scopus subject areas
- Parasitology
- Microbiology
- Virology